Summary of Potential Basin Boundary Modifications Santa Rosa Plain Groundwater Sustainability Agency Technical Advisory Committee Meeting February 12, 2018 sonomacountygroundwater.org
Presentation Summary • Review of DWR process/requirements for Bulletin 118 Basin Boundary Modification Requests • Santa Rosa Plain potential boundary modifications • Summary of potential modifications • Associated Pros/Opportunities and Cons/Challenges • Additional Considerations • Next Steps sonomacountygroundwater.org
DWR Schedule for 2018 Basin Boundary Modification Requests Submission Period opens for 6 month window - During this 6 month window, GSAs and local agencies can submit the required January 1, 2018 information to support a Basin Boundary Modification to the BBMRS on the SGMA Portal http://sgma.water.ca.gov/portal/#intro. Submission Period Closes and 30-day Public Comment Period opens - All information to support a boundary modification should be June 30, 2018 submitted to the BBMRS Public Comment Period Closes - DWR begins review of boundary July 30, 2018 modification requests and public comments Draft Basin Boundary Modifications released Fall 2018 Final Basin Boundary Modifications released Fall / Winter 2018 sonomacountygroundwater.org
Summary of DWR’s Revision Request Requirements • Notice and Consultation • Affected cities, agencies, water systems, residents • Public meetings • Description of Modification • How it will facilitate sustainable groundwater management • How it could impact other state and local programs • Hydrogeologic Conceptual Model • Technical Studies sonomacountygroundwater.org
Two Possible Considerations for Basin Boundary Modifications sonomacountygroundwater.org
Santa Rosa Plain Possible Technical Considerations: Eastern Boundary Expand eastern boundary to include the Rincon Valley sub-basin & northern Kenwood Valley basin • Rincon Valley sub-basin & northern Kenwood basin mostly within City of Santa Rosa limits. • Both areas currently very low priority groundwater basins that are hydrogeologically connected to the Santa Rosa Plain sub-basin. sonomacountygroundwater.org
Santa Rosa Plain Possible Technical Considerations: Eastern Boundary Expand eastern boundary to include the Rincon Valley sub-basin & northern Kenwood Valley basin • Rincon Valley sub-basin & northern Kenwood basin mostly within City of Santa Rosa limits. • Both areas currently very low priority groundwater basins that are hydrogeologically connected to the Santa Rosa Plain sub-basin. sonomacountygroundwater.org
Eastern Boundary Pros/Cons Pros/Opportunities Cons/Challenges • Would add ability for GSA to • Funding to make basin modification request manage, as part of it’s (estimated at $20,000 to $40,000) is not included in jurisdiction, an area that is GSA’s FY16/17 Budget. hydrogeologically interconnected with (and represents a source of • Resources would be diverted from work needed to inflow to) the Santa Rosa Plain initiate development of GSP. B118 basin. • Landowners/agencies/water systems that would be • Could lower any potential fees affected by modification may oppose the assessed to landowners within modification request, which would lead to current Santa Rosa Plain B118 uncertainty in DWR’s acceptance of the request. basin by spreading out costs over larger base of potential payers. • Existing data in the area is sparse and uncertain whether DWR will accept technical basis for boundary modification. • Adding to the GSA’s jurisdiction by expanding the Santa Rosa Plain B118 basin could potentially increase long-term costs to the GSA (associated with monitoring and managing this area). sonomacountygroundwater.org
Santa Rosa Plain Possible Technical Considerations: Western Boundary Expand the western boundary to include the Wilson Grove formation east of Sebastopol up to the watershed divide • Includes majority of Sebastopol & unincorporated areas • Wilson Grove Highlands basin is very low priority & hydrogeologically connected to Santa Rosa Plain basin sonomacountygroundwater.org
Santa Rosa Plain Possible Technical Considerations: Western Boundary Expand the western boundary to include the Wilson Grove formation east of Sebastopol up to the watershed divide • Includes majority of Sebastopol & unincorporated areas • Wilson Grove Highlands basin is very low priority & hydrogeologically connected to Santa Rosa Plain basin sonomacountygroundwater.org
Western Boundary Pros/Cons Pros/Opportunities Cons/Challenges • Would add ability for GSA to • Funding to make basin modification request (estimated manage, as part of it’s at $30,000 to $60,000) is not included in GSA’s FY16/17 jurisdiction, an area that is Budget. hydrogeologically • Resources would be diverted from work needed to interconnected with (and initiate development of GSP. represents a source of inflow • Landowners/agencies/water systems that would be to) the Santa Rosa Plain B118 basin. affected by modification may oppose the modification request, which would lead to uncertainty in DWR’s • Could lower any potential fees acceptance of the request. assessed to landowners within • Without additional data regarding location of western current Santa Rosa Plain B118 basin by spreading out costs flow divide, uncertain whether DWR will accept over larger base of potential technical basis for boundary modification payers. • Adding to the GSA’s jurisdiction by expanding the Santa Rosa Plain B118 basin could potentially increase long- term costs to the GSA (associated with monitoring and managing this area). sonomacountygroundwater.org
Other Considerations Regarding Possible Bulletin 118 Boundary Modification Bulletin 118 Basin Re-Prioritization: DWR anticipates basin re- prioritization by late winter/spring Potential Future Opportunities for Basin Boundary Modifications: Corresponding to future Bulletin 118 updates (next window potentially in 2023) sonomacountygroundwater.org
Summary of Options for Consideration (B118 Boundary) • No changes to existing boundaries (collect additional information under GSP and reconsider for next round). • Modify eastern boundary to include the Rincon Valley sub-basin & northern Kenwood Valley basin • Modify the western boundary to include the Wilson Grove formation east of Sebastopol up to the watershed divide sonomacountygroundwater.org
Next Steps – Possible Bulletin 118 Basin Boundary Modification Request • Overview of DWR Regulations for Basin Boundary January/February Modifications Requests 2018 • Consider viability of possible modification requests • Determine whether Basin Boundary Revision Request s February – April should be submitted (AC input in February/GSA Board decision in April) 2018 • Stakeholder outreach (as applicable) • Develop technical justification (as applicable) April – June 2018 • Submit Basin Boundary Revision Requests to DWR (if any) sonomacountygroundwater.org
Recommend
More recommend
